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This undated photo released by the U.S. Air Force, shows Lt. Gen. Susan Helms. Sen. Claire McCaskill, D-Mo. has put a hold on the nomination Helms, who is tapped to serve as vice commander of the U.S. Space Command. McCaskill said in a statement Thursday she wants more information about Helms' decision last year to overturn a jury conviction in a sexual assault case. (AP Photo/U.S. Air Force)

This undated photo released by the U.S. Air Force, shows Lt. Gen. Susan Helms. Sen. Claire McCaskill, D-Mo. has put a hold on the nomination Helms, who is tapped to serve as vice commander of the U.S. Space Command. McCaskill said in a statement Thursday she wants more information about Helms' decision last year to overturn a jury conviction in a sexual assault case. (AP Photo/U.S. Air Force)